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Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 284,947	$ 266,018
Software and hardware	46,648	45,710
Building and improvements	36,525	34,132
Land and improvements	2,817	3,787
Right-of-use assets	40,986	40,986
Property plant and equipment gross	411,923	390,633
Less: Accumulated depreciation and amortization	(277,862)	(249,621)
Property plant and equipment before construction in progress	134,061	141,012
Construction in progress	7,551	6,727
Total property, plant, and equipment, net	$ 141,612	$ 147,739

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Computer hardware and software, gross.

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Finance lease right of use asset gross.

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Property, plant and equipment and finance lease right-of-use asset, excluding construction in progress.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

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